The benefits of addressing the image suppression issue are significant. A recent controlled study by SubscriberMail demonstrated the response improvements gained by optimizing an email message to have impact even when images are not displayed. In this study, an email message that was not optimized for image suppression was sent to a test panel of approximately 50,000 subscribers. Simultaneously, a panel of similar makeup received a version of the same message optimized for non-graphical display. Compared to the non-optimized version, the optimized version saw an 87 percent increase in clicks.
This white paper explains what makes spam such an unbearable problem and how spamming tactics are evolving daily to beat anti-spam software. The latest tactic is to use the common PDF file format to send image spam. By using PDF attachments to send images instead of embedding them in the body of the email message, spammers have taken the cat-and-mouse game with anti-spam software developers to a new level.